Explosion-Proof Power Supply with Phase-Controlled DC Link Voltage
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Solution Overview
Problem
Existing power supply units for explosion-proof areas face inefficiencies and increased complexity due to the need for discrete circuit designs and stringent insulation requirements, especially when handling input voltages above 80 V, leading to higher space and production costs, and complex compliance testing.
Innovation Solution
A power supply unit design that reduces the input voltage below 80 V using a phase section control and DC link capacitance, allowing for integrated, efficient, and compact solutions by eliminating the need for complex insulation and creepage distances, utilizing a phase section control and DC link capacitance to manage voltage thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If discrete circuit design is used for power supply electronics in explosion-proof areas with input voltage above 80 V, then safety requirements are met, but efficiency decreases and space requirements increase
Solution Approach 1:
The patent changes the voltage parameter by reducing the DC link voltage to below 80 V through phase section control, which allows the use of integrated power supply ICs instead of discrete designs, thereby improving efficiency while maintaining explosion-proof safety
2Reliability
If discrete circuit design is used for power supply electronics in explosion-proof areas, then safety requirements are met, but device complexity and production costs increase
Solution Approach 1:
The patent merges multiple discrete components into integrated power supply ICs by reducing the voltage to below 80 V, which simplifies the circuit design and reduces the number of components that need to be individually tested and mounted, thereby reducing device complexity while maintaining safety
3Power
If DC link voltage is maintained above 80 V in power supply units for explosion-proof areas, then full power conversion is achieved, but insulation and creepage distance requirements increase space requirements
Solution Approach 1:
The patent uses phase section control to periodically connect and disconnect the rectified input voltage to the DC link capacitance, maintaining the DC link voltage below 80 V during specific time periods, which allows for compact circuit design without requiring extensive insulation and creepage distances
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient, compact, and cost-effective power supply solutions by reducing voltage to below 80 V, simplifying circuit design, and minimizing compliance testing efforts while maintaining compliance with explosion-proof standards.
Implementation Method 1
a DC link capacitance for buffering a DC link voltage
Implementation Method 2
a means for providing a rectified input voltage
Data Source
AI summary
The present invention refers to a power supply unit for operating an electronic device in an explosion-proof area, comprising:a means (2) for providing a rectified input voltage (UE);a DC link capacitance (5) for buffering a DC link voltage;a phase section control (4) controlled to apply the rectified input voltage to the DC link capacitance (5) during a time period in which the rectified input voltage (UE) increases and is between a lower (Uu) and upper voltage threshold (Uo), and to disconnect the rectified input voltage from the DC link capacitance (5) in the remaining time periods;a converter circuit (7) configured to convert the DC link voltage (UZ) into an output voltage.